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WO2010024573A2 - Afficheur à cristaux liquides à mode de commutation dans le plan - Google Patents

Afficheur à cristaux liquides à mode de commutation dans le plan Download PDF

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Publication number
WO2010024573A2
WO2010024573A2 PCT/KR2009/004731 KR2009004731W WO2010024573A2 WO 2010024573 A2 WO2010024573 A2 WO 2010024573A2 KR 2009004731 W KR2009004731 W KR 2009004731W WO 2010024573 A2 WO2010024573 A2 WO 2010024573A2
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Prior art keywords
liquid crystal
film
crystal display
mode liquid
refractive index
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Ceased
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PCT/KR2009/004731
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English (en)
Korean (ko)
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WO2010024573A3 (fr
WO2010024573A9 (fr
Inventor
최정민
이민희
조새한
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LG Chem Ltd
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LG Chem Ltd
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Priority to JP2011524897A priority Critical patent/JP5376473B2/ja
Priority to EP09810178A priority patent/EP2322980B1/fr
Priority to CN2009801334435A priority patent/CN102132199B/zh
Publication of WO2010024573A2 publication Critical patent/WO2010024573A2/fr
Publication of WO2010024573A3 publication Critical patent/WO2010024573A3/fr
Publication of WO2010024573A9 publication Critical patent/WO2010024573A9/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/13363—Birefringent elements, e.g. for optical compensation
    • G02F1/133634—Birefringent elements, e.g. for optical compensation the refractive index Nz perpendicular to the element surface being different from in-plane refractive indices Nx and Ny, e.g. biaxial or with normal optical axis
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/13363—Birefringent elements, e.g. for optical compensation
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1343—Electrodes
    • G02F1/134309—Electrodes characterised by their geometrical arrangement
    • G02F1/134363—Electrodes characterised by their geometrical arrangement for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2413/00—Indexing scheme related to G02F1/13363, i.e. to birefringent elements, e.g. for optical compensation, characterised by the number, position, orientation or value of the compensation plates
    • G02F2413/02—Number of plates being 2
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2413/00—Indexing scheme related to G02F1/13363, i.e. to birefringent elements, e.g. for optical compensation, characterised by the number, position, orientation or value of the compensation plates
    • G02F2413/07—All plates on one side of the LC cell
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2413/00—Indexing scheme related to G02F1/13363, i.e. to birefringent elements, e.g. for optical compensation, characterised by the number, position, orientation or value of the compensation plates
    • G02F2413/08—Indexing scheme related to G02F1/13363, i.e. to birefringent elements, e.g. for optical compensation, characterised by the number, position, orientation or value of the compensation plates with a particular optical axis orientation
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2413/00—Indexing scheme related to G02F1/13363, i.e. to birefringent elements, e.g. for optical compensation, characterised by the number, position, orientation or value of the compensation plates
    • G02F2413/12—Biaxial compensators

Definitions

  • the present invention relates to an in-plane switching (IPS) mode liquid crystal display device.
  • IPS in-plane switching
  • various polymer films are used for polarizing films, retardation films, plastic substrates, light guide plates, and the like.
  • TN twisted nematic
  • STN super twisted nematic
  • VA vertical alignment
  • IPS in-plane switching
  • Such a retardation film is produced through a method such as longitudinal uniaxial stretching, step biaxial stretching, simultaneous biaxial stretching, and the like after producing various polymer films.
  • the retardation film produced through the stretching process has a positive in-plane retardation value and a negative thickness direction retardation value, and these films can be applied to VA (Vertical Alignment) mode of the liquid crystal mode.
  • an in-plane switching (IPS) mode requires a retardation film having a positive in-plane retardation value and a positive thickness retardation value, but most polymer films have molecules arranged in a stretching direction during stretching. It has a positive in-plane retardation value and a negative thickness direction retardation value.
  • the compensation film for IPS mode uniaxially stretches a cyclic olefin polymer (COP), and then compensates for viewing angle by coating a nematic liquid crystal, which is a + C plate.
  • COP cyclic olefin polymer
  • the birefringence of the liquid crystal is very high, and even if the orientation and coating thickness of the liquid crystal are slightly changed, the phase difference of the entire compensation film is greatly changed, so that the phase difference control is difficult in the case of a thin film.
  • due to the high cost of liquid crystals there is a disadvantage in that it is difficult to be commercialized in general due to an increase in manufacturing cost.
  • An object of the present invention is to improve the viewing angle characteristics of an in-plane switching (IPS) mode liquid crystal display device, in-plane switching including a retardation film capable of appropriately adjusting the surface direction retardation value and the thickness direction retardation value It is to provide a mode liquid crystal display device.
  • IPS in-plane switching
  • a retardation film comprising 1) a first polarizing plate, 2) a liquid crystal cell, 3) a positive biaxial acrylic film and a negative C plate, and 4) an in-plane switching mode liquid crystal comprising a second polarizing plate
  • a display device Provided is a display device.
  • the contrast characteristics can be improved at the front and inclination angles of the liquid crystal display device in the in-plane switching (IPS) mode. Clear picture quality can be achieved.
  • IPS in-plane switching
  • FIG. 1 is a diagram illustrating a basic structure of an IPS mode liquid crystal display device for O-Mode according to the present invention.
  • FIG. 2 is a diagram illustrating a basic structure of an IPS mode liquid crystal display device for an E-Mode according to the present invention.
  • the liquid crystal panel of the present invention may be in O mode or may be in E mode.
  • the liquid crystal panel of the O mode refers to a mode in which the absorption axis direction of the polarizer disposed on the backlight side of the liquid crystal cell and the alignment direction of the liquid crystal cell are parallel to each other.
  • the liquid crystal panel of E mode means the mode in which the absorption axis direction of the polarizer arrange
  • the second polarizing plate 3 in the case of the liquid crystal panel of the O mode, the second polarizing plate 3, the positive biaxial film A and the negative C plate are preferably the observer side of the liquid crystal cell 2.
  • the first polarizing plate 1 is disposed on the backlight side of the liquid crystal cell.
  • the second polarizing plate 3 in the case of the liquid crystal panel of the E mode, it is preferable that the second polarizing plate 3 is disposed on the viewing side of the liquid crystal cell 2, and the first polarizing plate 1, the positive biaxial film (A) and the negative C plate are arranged on the backlight side of the liquid crystal cell 2.
  • the first polarizing plate is disposed on the backlight side of the liquid crystal cell, and the second polarizing plate and the positive biaxial acrylic film and the negative C plate are formed. It is characterized in that the retardation film containing is disposed on the observer side of the liquid crystal cell.
  • the absorption axis of the first polarizing plate and the absorption axis of the second polarizing plate are perpendicular, and the optical axis of the liquid crystal in the liquid crystal cell is parallel to the absorption axis of the first polarizing plate, and the positive biaxial axis.
  • the optical axis of the acrylic acrylic film is preferably parallel to the absorption axis of the second polarizing plate, but is not limited thereto.
  • a phase difference film including the first polarizing plate and the positive biaxial acrylic film and a negative C plate is disposed on the backlight side of the liquid crystal cell,
  • the second polarizing plate is characterized in that disposed on the observer side of the liquid crystal cell.
  • the absorption axis of the first polarizing plate and the absorption axis of the second polarizing plate are perpendicular, and the optical axis of the liquid crystal in the liquid crystal cell is parallel to the absorption axis of the second polarizing plate, and the positive biaxial
  • the optical axis of the acrylic acrylic film is preferably parallel to the absorption axis of the first polarizing plate, but is not limited thereto.
  • the positive biaxial acrylic film of 3) is prepared by melt extrusion or solution casting using an acrylic polymer, followed by a TD (transverse direction) stretching process. Can be prepared.
  • the stretching process performed during the production of the biaxial acrylic film in the amount of 3) may not only perform TD stretching after longitudinal uniaxial stretching, but may also perform only TD stretching. Since the TD stretching is performed by holding the widths of both films by the grip during the stretching process, the TD stretching may exhibit biaxial stretching characteristics, thereby manufacturing a biaxial stretching film.
  • the TD stretching process is an extension to increase the width of the film by the clip in the stretching section, which can be carried out each of the preheating step, the stretching step and the heat treatment step, it can be carried out continuously.
  • the stretching step in consideration of the glass transition temperature (Tg) of the acrylic non-stretched film, in the temperature range of (Tg-10 ° C) to (Tg + 10 ° C), it is possible to perform the reverse direction of the film direction, that is, TD stretching process Can be.
  • stretching temperature in the said extending process changes with kinds of resin to be used, Usually, 80-250 degreeC, 100-200 degreeC is preferable, and 110-160 degreeC is more preferable.
  • the draw ratio in the stretching step can be set by the expression of the thickness of the unstretched film and the appropriate retardation value, but usually 1.1 to 4 times is preferred.
  • the acrylic polymer preferably includes an acrylic copolymer including an acrylic monomer, an aromatic vinyl monomer, a maleic anhydride monomer, and a vinyl cyan monomer.
  • the acryl-based monomers are meant to include acrylate derivatives as well as acrylates, and should be understood as concepts including alkyl acrylates, alkyl methacrylates, alkyl butacrylates, and the like.
  • examples of the acrylic monomer include a compound represented by Formula 1 below:
  • R 1 , R 2, and R 3 each independently represent a hydrogen or a monovalent hydrocarbon group having 1 to 30 carbon atoms, including or without a hetero atom, and at least one of R 1 , R 2, and R 3 may be an epoxy group; ; R 4 represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms.
  • acrylic monomer examples include methyl methacrylate (methyl methacrylate), methacrylate (ethyl methacrylate), methacrylate (propyl methacrylate), n - butyl methacrylate (n -butyl methacrylate), t - T -butyl methacrylate, cyclohexyl methacrylate, benzyl methacrylate, methoxyethyl methacrylate, ethoxyethyl methacrylate ), Butoxymethyl methacrylate (butoxymethyl methacrylate), oligomers thereof and the like can be used, but is not limited thereto.
  • the content of the acrylic monomer in the acrylic copolymer is preferably 40 to 99% by weight.
  • the content of the acrylic monomer is less than 40% by weight, the high heat resistance and high transparency of the acrylic polymer may not be sufficiently expressed, and when the content of the acrylic monomer exceeds 99% by weight, there may be a problem that the mechanical strength falls.
  • aromatic vinyl monomer of the acrylic copolymer examples include styrene, ⁇ -methyl styrene, 4-methyl styrene, and the like, but are preferably styrene, but are not limited thereto.
  • the content of the aromatic vinyl monomer in the acrylic copolymer is preferably 1 to 60% by weight.
  • the content of the maleic anhydride monomer in the acrylic copolymer according to the present invention is preferably 5 to 30% by weight.
  • the content of the maleic anhydride-based monomer is more than 30% by weight there may be a problem that the breakage of the film is increased to easily break the film.
  • maleic anhydride monomer of the acrylic copolymer examples include maleic anhydride and the like, and the vinyl cyanic monomer may include acrylonitrile, methacrylonitrile, etaacrylonitrile, and the like. It is not.
  • the content of the vinyl cyan monomer in the acrylic copolymer is preferably 0.1 to 10% by weight.
  • the positive biaxial acrylic film of 3) may further include a rubber component.
  • the positive biaxial film is a refractive index (n x ) in the direction having the largest refractive index in the plane direction of the film, a refractive index (n y ) in the vertical direction in the n x direction in the plane direction of the film, and thickness Meaning that the directional refractive index (n z ) satisfies the relationship nz>nx> ny, respectively.
  • the rubber component is preferably an acrylic rubber, a rubber-acrylic graft core-shell polymer, or a mixture thereof, but is not limited thereto.
  • the acrylic rubber is not particularly limited as long as the acrylic rubber having a refractive index of 1.480 to 1.550 having a similar refractive index with the acrylic resin can be obtained when the refractive index of the acrylic resin and the rubber component is similar.
  • alkyl acrylates such as butyl acrylate and 2-ethylhexyl acrylate, etc. are mentioned.
  • the rubber-acrylic graft core-shell polymer is not particularly limited as long as the rubber-acrylic graft core-shell polymer has a refractive index of 1.480 to 1.550.
  • particles having a size of 50 to 400 nm using a butadiene, butyl acrylate or butyl acrylate-styrene copolymer-based rubber as a core, and polymethyl methacrylate or polystyrene as a shell can be used.
  • the content of the rubber component is preferably 1 to 50 parts by weight, more preferably 10 to 30 parts by weight with respect to 100 parts by weight of the acrylic copolymer. If the content of the rubber component is less than 1 part by weight, it may not be possible to express the excellent mechanical strength of the film, the film is brittle, there is a problem in the processing process, there is a problem that the optical performance is not sufficiently expressed. In addition, when the content exceeds 30 parts by weight, there is a problem in that the high heat resistance and high transparency of the acryl-based copolymer are not sufficiently expressed, and processing problems may occur such as haze in the stretching process.
  • the plane direction retardation value represented by the following equation (1) is 60 to 150 nm
  • the thickness direction retardation value represented by the following equation (2) is preferably 100 to 200 nm.
  • n x is a refractive index of the direction of the largest refractive index in the plane direction of the film
  • n y is a refractive index in the vertical direction in the n x direction in the plane direction of the film
  • n z is the refractive index in the thickness direction
  • d is the thickness of the film.
  • the glass transition temperature (Tg) of the positive biaxial acrylic film of said 3) is 100-250 degreeC.
  • the film having a glass transition temperature (Tg) of 100 to 250 ° C. may have excellent durability.
  • the positive biaxial acrylic film of 3) has a surface direction retardation value represented by Equation 1 and a thickness direction retardation value represented by Equation 2 being R th > R in .
  • the positive biaxial acrylic film used in the present invention is R when stretched. Since the value of th / R in is larger than 1, it is necessary to lower the value of R th .
  • the present invention can adjust the R th / R in value of the entire retardation film by introducing a negative C plate to the positive biaxial acrylic film.
  • the negative C plate is a refractive index (n x ) in the direction having the largest refractive index in the plane direction of the film, a refractive index (n y ) in the vertical direction in the n x direction in the plane direction of the film, and a thickness direction refractive index ( n z ) means satisfying the relationship of n x ⁇ n y > n z .
  • the negative C plate has a negative birefringence value in the thickness direction and uses a material having a high birefringence, and prepares a polymer solution of 10 to 30 wt% or less, and then forms a thin film on the positive biaxial acrylic film. It can manufacture by a coating method.
  • the material having a negative retardation value in the thickness direction and having a high birefringence may include a compound including an aromatic ring or a cycloolefin-based polymer in the polymer main chain, and more specific examples thereof include polyarylate and polynorbornene ( polynorbornene, polycarbonate, polysulfone, polyimide, cellulose and derivatives thereof, and the like, but are preferably polyarylate and cellulose derivatives, but are not limited thereto.
  • the polyarylate may include a compound represented by the following Formula 2.
  • n is an integer of 1 or more.
  • the plane retardation value represented by Equation 1 is preferably 0 to 10 nm, more preferably 0 to 5 nm, and most preferably 0 to 3 nm.
  • the thickness direction retardation value represented by the above formula (2) is preferably -40 ⁇ -150nm.
  • the IPS mode liquid crystal display according to the present invention can realize a wider viewing angle characteristic by using a positive biaxial acrylic film and a negative C plate in combination as a retardation film. That is, since the positive biaxial acrylic film is R th / R in > 1 and the thickness direction retardation value is negative C negative plate can be adjusted to R th / R in ⁇ 1, the polarizing plate And light leakage generated in the IPS mode liquid crystal panel can be minimized.
  • the R th / R in value of the 3) acrylic retardation film is more preferable when it is 1.1 to 6.
  • the acrylic retardation film has a positive plane direction retardation value and a positive thickness direction retardation value at the time of stretching, but the ratio of the two values is more easily developed than 1, and the IPS mode liquid crystal display using the IPS mode does not use a viewing angle compensation film. As compared with the mode liquid crystal display, there may be a problem in that there is no light leakage at an inclination angle but a relatively low contrast ratio value.
  • the plane direction retardation value represented by Equation (1) of the total retardation film including 3) the positive biaxial acrylic film and the negative C plate is 60 ⁇ 150nm. It is preferable that it is more preferable that the thickness direction retardation value represented by said Formula (2) is 30-120 nm.
  • the negative C plate has a thickness of 0.5 to 30 ⁇ m, and the thickness of the total retardation film including a positive biaxial acrylic film and a negative C plate is preferably 20 to 100 ⁇ m, but not limited thereto. It doesn't happen.
  • the 3) retardation film may further include a buffer layer between the positive biaxial acrylic film and the negative C plate.
  • the buffer layer may serve to enhance adhesion between the positive biaxial acrylic film and the negative C plate and to suppress solvent erosion to the substrate.
  • the buffer layer may include a compound selected from the group consisting of an acrylate polymer, a methacrylate polymer, and an acrylate / methacrylate copolymer capable of UV curing or heat curing, but is not limited thereto.
  • materials composed of uncured pure polymers are also possible, and examples of these materials include cellulose derivatives, styrene-based and anhydride-based copolymers, and the like.
  • the buffer layer may be formed in a good thickness range of coating processability without eroding the solvent, more specifically, the thickness of the buffer layer may be formed of 0.2 ⁇ 3 ⁇ m.
  • the 3) retardation film may further include an adhesive layer between the positive biaxial acrylic film and the negative C plate.
  • the adhesive layer may be implemented by coating on the negative C plate layer, or may be attached to the acrylic film through transfer.
  • the adhesive layer may be selected from natural rubber, synthetic rubber or elastomer, vinyl chloride / vinyl acetate copolymer, polyvinyl alkyl ether, polyacrylate, modified polyolefin-based compound, and the like, and a compound including a curing agent such as isocyanate. It is not limited.
  • the optical axis of the said positive biaxial acrylic film has the characteristic parallel to the absorption axis of the said 4) 2nd polarizing plate.
  • the optical axis of the positive biaxial acrylic film and the absorption axis of the second polarizing plate are not parallel to each other, light leakage may occur due to light leakage between the first polarizing plate and the second polarizing plate at an inclination angle on the optical path. have.
  • the 1) absorption axis of the first polarizing plate and 4) the absorption axis of the second polarizing plate have a perpendicular characteristic to each other.
  • the 1) first polarizing plate and 4) the second polarizing plate include a polarizing element.
  • the polarizer may be a film made of polyvinyl alcohol (PVA) containing iodine or dichroic dye.
  • PVA polyvinyl alcohol
  • the polarizer may be prepared by dyeing iodine or dichroic dye on a PVA film, but a method of manufacturing the same is not particularly limited.
  • the 1) first polarizing plate and 4) the second polarizing plate may include a protective film on one or both sides of the polarizer.
  • the protective film may include a triacetate cellulose (TAC) film, a polynorbornene-based film made of ring opening metathesis polymerization (ROMP), and a HROMP (ring) obtained by hydrogenating a ring-opened polymerized cyclic olefin-based polymer.
  • TAC triacetate cellulose
  • ROMP ring opening metathesis polymerization
  • HROMP ring obtained by hydrogenating a ring-opened polymerized cyclic olefin-based polymer.
  • opening metathesis polymerization followed by hydrogenation may be a polymer film, a polyester film, or a polynorbornene-based film made by addition polymerization.
  • a film made of a transparent polymer material may be used as the protective film, but is not limited thereto.
  • the 3) retardation film may be disposed between the 4) the second polarizing plate and 2) the liquid crystal cell, and 3) the negative C plate of the retardation film is 2) may be disposed in contact with the liquid crystal cell.
  • FIG. 1 shows the basic structure of an IPS mode liquid crystal display.
  • the IPS mode liquid crystal display device includes a first polarizing plate 1, a second polarizing plate 3, and a liquid crystal cell 2, and an absorption axis of the first polarizing plate 1 and an absorption axis of the second polarizing plate 3 are formed. It is disposed perpendicular to each other, the absorption axis of the second polarizing plate 3 and the optical axis of the positive biaxial acrylic film (A) is arranged in parallel, between the positive biaxial acrylic film (A) and the liquid crystal cell (2)
  • the negative C plate layer is arranged to be located.
  • a buffer layer having no surface direction and thickness direction retardation values may be disposed between the positive biaxial acrylic film A and the negative C plate layer, and may further include an adhesive layer.
  • polyarylate U-100, Unitica Co., Ltd.
  • dichloroethane 7.5 wt%
  • coated on a uniaxially stretched acrylic copolymer film using a bar-coater.
  • the polarizing plates were laminated as in the procedure of FIG. 1, and then laminated on the IPS mode liquid crystal display panel, and contrast ratios were measured at an inclination angle of 60 ° with an Eldim, and the sharpness of image quality was compared.
  • the second polarizing plate was affixed in the same manner in both Examples and Comparative Examples polarized plate laminated in the order of zero retardation TAC (ORT) / PVA / TAC.
  • Comparative Example 1 the first polarizing plate and the second polarizing plate were compared with the polarizing plates laminated in the order of ORT / PVA / TAC.
  • the contrast ratio value is an index indicating the sharpness of the screen.
  • Example 1 Positive biaxial film Negative C Plate Tilt angle 60 ° contrast ratio Rin (nm) Rth (nm) Rth (nm) Thickness ( ⁇ m)
  • Example 1 100 130 -40 1.7 50: 1
  • Example 2 110 150 -60 2.7 70: 1
  • Example 3 120 160 -80 4.0 100: 1
  • Example 4 120 160 -100 6.2
  • Example 5 120 160 -120 10.4 180: 1 Comparative Example 1 120 125 - - 20: 1
  • the inclination angle 60 ° contrast ratio is a contrast ratio value at 45 degrees upward.
  • the contrast ratio values of Examples 1 to 5 according to the present invention are 50 to 180: 1, which is much better than 20: 1, which is the contrast ratio value of Comparative Example 1. Since the contrast ratio value is an indicator for displaying the sharpness of the screen, the liquid crystal display according to the present invention can implement a clearer picture quality.
  • the IPS mode liquid crystal display according to the present invention can improve contrast characteristics at the front and the inclination angles, thereby realizing a clear image quality of the liquid crystal display.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Polarising Elements (AREA)

Abstract

La présente invention concerne un afficheur à cristaux liquides à mode de commutation dans le plan (IPS). Plus particulièrement, l'afficheur à cristaux liquides à mode IPS de l'invention comprend : (1) une première plaque de polarisation, (2) une cellule à cristaux liquides, (3) un film de retardement possédant un film acrylique bi-axial positif et une plaque C négative, et (4) une deuxième plaque de polarisation, améliorant ainsi les caractéristiques de contraste sur la surface avant et l'angle d'inclinaison de cet afficheur à cristaux liquides à mode IPS.
PCT/KR2009/004731 2008-08-27 2009-08-25 Afficheur à cristaux liquides à mode de commutation dans le plan Ceased WO2010024573A2 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2011524897A JP5376473B2 (ja) 2008-08-27 2009-08-25 面内スイッチングモードの液晶表示装置
EP09810178A EP2322980B1 (fr) 2008-08-27 2009-08-25 Afficheur à cristaux liquides à mode de commutation dans le plan
CN2009801334435A CN102132199B (zh) 2008-08-27 2009-08-25 面内转换模式液晶显示器

Applications Claiming Priority (2)

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KR10-2008-0083830 2008-08-27
KR1020080083830A KR101197162B1 (ko) 2008-08-27 2008-08-27 면상 스위칭 모드 액정 표시 장치

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WO2010024573A3 WO2010024573A3 (fr) 2010-07-08
WO2010024573A9 WO2010024573A9 (fr) 2010-09-10

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EP (1) EP2322980B1 (fr)
JP (1) JP5376473B2 (fr)
KR (1) KR101197162B1 (fr)
CN (1) CN102132199B (fr)
TW (1) TWI395018B (fr)
WO (1) WO2010024573A2 (fr)

Families Citing this family (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101314480B1 (ko) * 2008-12-26 2013-10-07 주식회사 엘지화학 면상 스위치 모드 ｌｃｄ용 편광판 및 이를 포함하는 면상 스위치 모드 ｌｃｄ
JPWO2012008326A1 (ja) * 2010-07-12 2013-09-09 デクセリアルズ株式会社 原盤の製造方法、配向膜の製造方法、位相差板の製造方法および表示装置の製造方法
JP5576238B2 (ja) * 2010-10-25 2014-08-20 京セラディスプレイ株式会社 液晶表示装置
KR101304591B1 (ko) * 2011-07-06 2013-09-05 주식회사 엘지화학 위상차 필름, 이의 제조방법, 및 이를 포함하는 액정 표시 장치
US9315412B2 (en) * 2011-07-07 2016-04-19 Corning Incorporated Surface flaw modification for strengthening of glass articles
CN102636920A (zh) * 2011-07-19 2012-08-15 京东方科技集团股份有限公司 一种硬屏液晶显示的装置和实现方法及其应用
TWI516537B (zh) * 2011-10-04 2016-01-11 Ｌｇ化學股份有限公司 樹脂組成物及使用其形成之光學補償膜
KR101418755B1 (ko) 2011-10-05 2014-07-11 주식회사 엘지화학 광학 필름용 수지 조성물 및 이를 이용한 보상필름
CN102681248A (zh) * 2012-05-10 2012-09-19 京东方科技集团股份有限公司 液晶显示器
US9358768B2 (en) * 2012-12-17 2016-06-07 Samsung Sdi Co., Ltd. Polarizing plate, method of preparing the same, and liquid crystal display apparatus including the same
KR102078021B1 (ko) * 2012-12-31 2020-02-17 엘지디스플레이 주식회사 편광판과 그 제조 방법 및 이를 포함하는 액정표시장치
KR102101794B1 (ko) 2013-07-17 2020-04-20 삼성디스플레이 주식회사 액정 표시 장치
KR101708967B1 (ko) * 2013-09-30 2017-02-21 주식회사 엘지화학 위상차 필름 및 그 제조 방법
KR101640970B1 (ko) * 2013-09-30 2016-07-19 주식회사 엘지화학 위상차 필름 및 그 제조 방법
KR101727361B1 (ko) * 2014-05-21 2017-04-14 주식회사 엘지화학 위상차 필름 및 그 제조 방법
KR101724797B1 (ko) * 2014-08-14 2017-04-07 주식회사 엘지화학 위상차 필름 및 그 제조 방법
KR101725590B1 (ko) * 2014-08-14 2017-04-10 주식회사 엘지화학 위상차 필름 및 그 제조 방법
KR101725591B1 (ko) * 2014-08-14 2017-04-10 주식회사 엘지화학 위상차 필름 및 그 제조 방법
KR101725592B1 (ko) * 2014-08-14 2017-04-10 주식회사 엘지화학 위상차 필름 및 그 제조 방법
KR101725593B1 (ko) * 2014-08-14 2017-04-10 주식회사 엘지화학 위상차 필름 및 그 제조 방법
JP2017198774A (ja) * 2016-04-26 2017-11-02 スタンレー電気株式会社 液晶表示装置
CN106154639B (zh) 2016-09-29 2020-01-10 厦门天马微电子有限公司 一种液晶显示面板及液晶显示装置
KR102134948B1 (ko) * 2017-12-21 2020-07-16 주식회사 엘지화학 광학 필름 및 이를 포함하는 편광판
US11467449B2 (en) 2018-06-01 2022-10-11 Lg Chem, Ltd. Liquid crystal display device
KR102143271B1 (ko) * 2018-06-05 2020-08-10 주식회사 엘지화학 적층체 및 이를 포함하는 액정 표시 장치
KR102625542B1 (ko) * 2018-11-20 2024-01-15 엘지디스플레이 주식회사 전계발광 표시장치

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100223601B1 (ko) * 1997-05-29 1999-10-15 윤종용 액정 표시 장치
TWI242083B (en) * 2003-08-11 2005-10-21 Sony Corp Liquid crystal display device
KR100601916B1 (ko) * 2003-11-21 2006-07-14 주식회사 엘지화학 양의 이축성 위상차 필름을 이용한 시야각 보상필름을포함하는 면상 스위칭 액정 표시장치
KR100601920B1 (ko) * 2004-01-09 2006-07-14 주식회사 엘지화학 음의 이축성 위상차 필름과 +ｃ-플레이트를 이용한 시야각보상필름을 포함하는 면상 스위칭 액정 표시장치
US7400371B2 (en) * 2004-02-03 2008-07-15 Sumitomo Chemical Company, Limited Liquid crystal display having particular retardation plate
JP2005321528A (ja) * 2004-05-07 2005-11-17 Fuji Photo Film Co Ltd 液晶表示装置
JP3851919B2 (ja) * 2004-12-20 2006-11-29 日東電工株式会社 液晶パネルおよび液晶表示装置
JP3883134B2 (ja) * 2005-01-25 2007-02-21 日東電工株式会社 液晶表示装置
KR20070106763A (ko) * 2005-02-08 2007-11-05 니폰 오일 코포레이션 (신 니혼 세키유 가부시키 가이샤) 호메오트로픽 배향 액정필름, 이를 이용한 광학필름 및화상표시장치
US7605895B2 (en) * 2005-06-14 2009-10-20 Lg Chem, Ltd. IPS mode liquid crystal display using two sheets of biaxial negative retardation film and a plate
US7671945B2 (en) * 2005-09-30 2010-03-02 Teledyne Scientific & Imaging, Llc UV curable alignment material for fabrication of monolithic compensators for liquid crystal displays
JP2007279127A (ja) * 2006-04-03 2007-10-25 Nitto Denko Corp 液晶パネル、液晶テレビ、および液晶表示装置
US7751006B2 (en) * 2006-09-29 2010-07-06 Dai Nippon Printing Co., Ltd. Optical element, liquid crystal display device member with the optical element, liquid crystal display device with the liquid crystal display device member, method of producing the optical element and method of evaluating birefringence functional layer
KR100964786B1 (ko) * 2006-10-23 2010-06-21 주식회사 엘지화학 광학필름, 위상차 필름, 및 이들을 포함하는 액정 표시장치

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
None
See also references of EP2322980A4

Also Published As

Publication number Publication date
JP5376473B2 (ja) 2013-12-25
EP2322980A2 (fr) 2011-05-18
JP2012501464A (ja) 2012-01-19
KR101197162B1 (ko) 2012-11-09
KR20100025171A (ko) 2010-03-09
EP2322980A4 (fr) 2011-08-24
TWI395018B (zh) 2013-05-01
WO2010024573A3 (fr) 2010-07-08
US20100053508A1 (en) 2010-03-04
US8243239B2 (en) 2012-08-14
CN102132199A (zh) 2011-07-20
WO2010024573A9 (fr) 2010-09-10
CN102132199B (zh) 2013-11-13
EP2322980B1 (fr) 2012-12-26
TW201015160A (en) 2010-04-16

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